问答题
R1，R2，R3 are all in same ospf area， there is a virtual link between R1 and R3. Pls answer： Are the hello packets exchanged between the virtual link？
The hello packets will not be exchanged between R1 and R3.
多项选择题 UnderwhichtwocircumstanceswouldanRSTPbridgeflushitsCAMtable？（）
单项选择题 WhydoesRSTPhaveabetterconvergencetimethan802.1D？（）
单项选择题 Refer to the exhibit. Which of these is applied to the Bearer class？（）
